Dust-collector.



No. 795,750. PATENTED JULY 25, 1905.

w. E. ALLINGTON.

DUST COLLECTOR.

APPLICATION FILED APB.. 14.1904.

Hail;

UNITED sTATEs PATENT oEEIoE.

DUST-COLLECTOR.

lLND. 795.750,

Specification of Letters Patent.

Patented July 25, 1905.

Appiicaeoa ne@ Aprii 14,1904. serial No. 203,082.

To a/ZZ whom, t may concern.'

Be it known that I, WILLIAE E. ALLINGTON, of Saginaw, in the county ofSaginaw and State of Michigan, have invented certain new and usefulImprovements in Dust-Collectors; and I hereby declare that the followingis a full, clear, and exact description thereof, reference being had tothe accompanying drawings, which form part of this specification.

- My invention relates to improvements in dust-collectors, and moreparticularly to dustcollectors of the type known as centrifugalmachines, wherein the dust particles are driven to certain areas of themachine, as the result of centrifugal action, and the purified air ispermitted to escape.

A salient object of my invention is to provide a machine of the classdescribed particularly adapted for the heavier class of work, such as isencountered in woodworking-shops and the like, wherein the arrangementis such that the air may escape very freely and the back pressure uponthe fan or blower employed in conjunction with the collector therebykept down.

Other and further objects of my invention will hereinafter becomeapparent from the following description taken in conjunction with thedrawings.

In the drawings, wherein I have illustrated an operative embodiment ofmy invention, Figure 1 is a central vertical section of the machine.Fig. 2 is a top plan view, and Fig. 3 is a transverse section on line 33 of Fig. 1.

Throughout the various figures like numerals of reference refer alwaysto like parts.

In the drawings, 5 indicates a casing member, preferably cylindrical informclosed at its top and preferably open at its bottom and inclosingwhat I will term the "inner separating-chamber 6. The opening at the`bottom of chamber 6 may be less than the entire end area of the casing,though I prefer the present form for simplicity.

7 indicates an inlet-orifice, into which leads an inlet-spout 8,longitudinally or otherwise arranged, so that the introduction of airtherethrough induces a whirl in the chamber 6.

9 indicates a casing member, preferably cylindrical in form, concentricwith and surrounding the casing member 5, said casing member 9 beingprovided with a top 10, preferably arranged below the level of theinletspout 8 of the inner chamber and closing the annular space betweenthe inner casing member 5 and the outer casing member 9. The

chamber 11 within the casing member 9 I will` This spout, however, maybe omitted, if desired.

Along the wall 9 of the outer chamber I provide one or moredeiecting-ribs 16 of any suitable cross sectional configuration,disposed in spiral arrangement, such that the spiral leads downward whenfollowed in the direction taken by the air-whirl within the chamber 11.

The structure thus far described forms in itself a complete andoperative machine; but I preferably employ as an adjunct to the machinean axially-disposed tube 17, suitably supported in the structure andextending from a point adjacent the dust-outlet 13 to a plane about onthe level of the inlet-opening 7 of the inner chamber.

In operation the dust-laden air is blown or otherwise forcibly projectedthrough the tangential inlet 8 and assumes a whirling motion in theinner chamber 6. Thevdust-laden air follows a spiral path downward insaid chamber to the open lower end thereof, and by its whirling motionthe dust particles are thrown outward and massed against the peripheralwall 5 of the chamber. Upon escaping from the inner chamber to the outerchamber 11 the air continues its whirling motion, but in anupwardly-tending spiral path, seeking the outlet-opening 111. It will beapparant that the larger coarser dust particles will travel under theinfluence of gravity into thehopper 12, but those lighter particleswhich are carried upward by the ascending current of air are maintainedby centrifugal action at the outer end of the whirl, where they are-caught by the deiiectors 16 and directed downward until they reach aplane practically without the influence of the ascending-air current,whence they travel into the hopper l0 and through the dust-outlet 13. YA machine of this construction is particularly adapted for work inenvironments requiring the use of strong currents of air, as in handlingcoarse material, and it is, therefore, at times advantageous to employmeans to prevent the air from blowing too strongly out of thedust-outlet 13. To this end the tube 17 is employed. It will be apparentthat as the air is projected at a high speed through the tangentialinlet 8 and begins its whirl in the chamber 6 centrifugal action tendsto produce a rarefaction of the central or axial air-column, and anupward draft is thereby induced through the tube 17. It will be apparentthat as the air-current fiowing through the tube 17 is drawn from apoint adjacent the dust-outlet 13 pressure at that point is relieved andthe escape of air through said outlet 13 correspondingly reduced.

While I have herein described in some detail one operative embodiment ofmy invention, it will be apparent that numerous changes in the detailsof construction might be made therein without departing from the spiritand scope of my invention.

Having thus described my invention, what I claim, and desire to secureby Letters Patent of the United States, is-

1. In a dust-collector, an inner chamber having an imperforateperipheral wall, open at its lower end through which the material,concentrated by. centrifugal force, escapes downwardly; an outer chamberinto which, .below the top thereof, said inner chamber opens, providedat its lower end with a dust-outlet opening and provided with anair-outlet open ing above the open'bottom of the inner chamber; adownwardly-directed spiral deflector in said outer chamber, arranged onthe peripheral wall thereof for deiiecting material downward in saidchamber; and a tangential inlet opening into the inner chamber soarranged as to induce a whirl therein.

2. In a dust-collector, an inner chamber having an imperforateperipheral wall, open at its lower end through which the material,concentrated by centrifugal force, escapes downwardly; an outer chamberinto which, below the top thereof, said inner chamber opens, provided atits lower end with a dust-outlet opening and provided with an air-outletopening above the open bottom of the inner chamber; adownwardly-directed spiral deiiector in said outer chamber, arranged onthe peripheral wall thereof for deiiecting material downward in saidchamber; a tangential inlet opening into the inner chamber so arrangedas to induce a whirl therein, and a tube having an open passageextending from an axial point within the inner chamber to an axial pointwithin the lower conical chamber at the dust-outlet end.

In testimony that I claim the foregoing as my own I aiiiX my signaturein presence of two witnesses.

WILLIAM E. ALLINGTON In presence of- FoRE BAIN, MARY F. ALLEN.

